Interior vs Exterior Paint: What's the Difference?

Many homeowners wonder if they can use the same paint inside and outside their home. The short answer is no -- interior and exterior paints are formulated differently for good reasons. Here's what you need to know.

Key Differences Between Interior and Exterior Paint

1. Weather Resistance

Exterior paint is designed to withstand Melbourne's harsh conditions:

• UV resistance to prevent fading in sun
• Water resistance for rain protection
• Flexibility to expand and contract with temperature changes
• Mildew and mould resistance

Interior paint doesn't need these properties, so it's formulated differently for indoor conditions.

2. Chemical Composition

Exterior paints contain additives that help them resist weathering but may release fumes. They're safe for outdoor use where ventilation is unlimited.

Interior paints are formulated with lower VOCs (volatile organic compounds) for better indoor air quality. Low-VOC and zero-VOC options are available for homes with children or those sensitive to chemicals.

3. Durability Focus

Exterior paint is built to resist:

• Sun damage and fading
• Cracking and peeling
• Moisture penetration
• Temperature extremes

Interior paint is built to resist:

• Scuffs and marks
• Stains and spills
• Easy cleaning and scrubbing
• Daily wear and tear

Can You Use Interior Paint Outside?

No. Interior paint will fail quickly when exposed to outdoor conditions. Within months, you'll see:

• Cracking and peeling
• Significant colour fading
• Chalking (powdery surface)
• Mould and mildew growth

Can You Use Exterior Paint Inside?

Not recommended. While it would stick to walls, exterior paint:

• Releases more fumes during drying
• May have a stronger odour
• Doesn't scrub as well as interior paint
• Costs more than necessary

Paint Finishes Explained

Both interior and exterior paints come in different finishes:

• Flat/Matte: Hides imperfections, ideal for ceilings and low-traffic areas
• Eggshell: Slight sheen, good for living rooms and bedrooms
• Satin: Easy to clean, perfect for kitchens and bathrooms
• Semi-gloss: Durable and washable, great for trim and doors
• Gloss: Highly reflective, used for accent features

Choosing Quality Paint

Whether interior or exterior, quality paint matters. We recommend premium brands like:

• Dulux Weathershield (exterior)
• Dulux Wash & Wear (interior)
• Taubmans Endure (exterior)
• Taubmans Easy Coat (interior)